diff --git a/pyevmasm/evmasm.py b/pyevmasm/evmasm.py
index 668b4ba..fbce7ab 100644
--- a/pyevmasm/evmasm.py
+++ b/pyevmasm/evmasm.py
@@ -5,7 +5,7 @@
 from future.builtins import next, bytes  # type: ignore
 import copy
 
-DEFAULT_FORK = "shanghai"
+DEFAULT_FORK = "dencun"
 
 """
     Example use::
@@ -1095,12 +1095,33 @@ def __repr__(self):
     london_instruction_table, previous_fork=istanbul_instruction_table
 )
 
-shanghai_instruction_table = {0x5f: ("PUSH", 0, 0, 1, 2, "Place 0 constant byte item on stack.")}
+shanghai_instruction_table = {
+    0x5F: ("PUSH", 0, 0, 1, 2, "Place 0 constant byte item on stack.")
+}
 
 shanghai_instruction_table = InstructionTable(  # type: ignore
     shanghai_instruction_table, previous_fork=london_instruction_table
 )
 
+dencun_instruction_table = {
+    0x5E: ("MCOPY", 0, 3, 0, 3, "Copy memory areas."),
+    0x49: ("BLOBHASH", 0, 1, 1, 1, "Get versioned hashes."),
+    0x4A: (
+        "BLOBBASEFEE",
+        0,
+        0,
+        1,
+        2,
+        "Returns the value of the blob base-fee of the current block.",
+    ),
+    0x5C: ("TLOAD", 0, 1, 1, 100, "Load word from transient storage."),
+    0x5D: ("TSTORE", 0, 2, 0, 100, "Save word to transient storage."),
+}
+
+dencun_instruction_table = InstructionTable(  # type: ignore
+    dencun_instruction_table, previous_fork=shanghai_instruction_table
+)
+
 accepted_forks = (
     "frontier",
     "homestead",
@@ -1112,7 +1133,8 @@ def __repr__(self):
     "serenity",
     "istanbul",
     "london",
-    "shanghai"
+    "shanghai",
+    "dencun",
 )
 
 
@@ -1128,6 +1150,7 @@ def __repr__(self):
     "istanbul": istanbul_instruction_table,
     "london": london_instruction_table,
     "shanghai": shanghai_instruction_table,
+    "dencun": dencun_instruction_table,
 }
 
 
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_EVMAssembler.py b/tests/test_EVMAssembler.py
index 1a44b68..caf832c 100644
--- a/tests/test_EVMAssembler.py
+++ b/tests/test_EVMAssembler.py
@@ -135,6 +135,26 @@ def test_shanghai_fork(self):
         self.assertTrue(insn.pops == 0)
         self.assertTrue(insn.pushes == 1)
         self.assertTrue(insn.operand_size == 0)
+    
+    def test_dencun_fork(self):
+        insn = EVMAsm.disassemble_one(b"\x5e", fork="dencun")
+        self.assertTrue(insn.mnemonic == "MCOPY")
+        self.assertTrue(insn.fee == 3)
+        self.assertTrue(insn.pops == 3)
+        self.assertTrue(insn.pushes == 0)
+        self.assertTrue(insn.operand_size == 0)
+
+        insn = EVMAsm.disassemble_one(b"\x49", fork="dencun")
+        self.assertTrue(insn.mnemonic == "BLOBHASH")
+
+        insn = EVMAsm.disassemble_one(b"\x4a", fork="dencun")
+        self.assertTrue(insn.mnemonic == "BLOBBASEFEE")
+
+        insn =  EVMAsm.disassemble_one(b"\x5c", fork="dencun")
+        self.assertTrue(insn.mnemonic=="TLOAD")
+
+        insn =  EVMAsm.disassemble_one(b"\x5d", fork="dencun")
+        self.assertTrue(insn.mnemonic=="TSTORE")
 
     def test_assemble_DUP1_regression(self):
         insn = EVMAsm.assemble_one("DUP1")